To solve this problem, we need to match the contraceptive methods in List I with their corresponding descriptions in List II. Let's analyze each method:$\newline \bullet$a. Vaults:$\newline$ - Vaults are barrier methods of contraception that prevent the entry of sperm through the cervix.$\newline$ - This matches with (i) Entry of sperm through Cervix is blocked.$\newline \bullet$b. IUDs:$\newline$ - Intrauterine devices (IUDs) are inserted into the uterus and can cause phagocytosis of sperms within the uterus.$\newline$ - This matches with (iii) Phagocytosis of sperms within the Uterus.$\newline \bullet$c. Vasectomy:$\newline$ - Vasectomy is a surgical procedure involving the removal or cutting of the vas deferens to prevent sperm from entering the ejaculate.$\newline$ - This matches with (ii) Removal of Vas deferens.$\newline \bullet$d. Tubectomy:$\newline$ - Tubectomy is a surgical procedure involving the removal or blocking of the fallopian tubes to prevent eggs from reaching the uterus.$\newline$ - This matches with (iv) Removal of fallopian tube.$\newline$Now, let's match the items from List I with List II:$\newline a \rightarrow i, b \rightarrow iii, c \rightarrow ii, d \rightarrow iv \newline$This corresponds to Option 2.